Python-Scapy等 - 我如何在数据包级别创建HTTP GET请求 [英] Python-Scapy or the like-How can I create an HTTP GET request at the packet level

问题描述

为了提高我对网络的一般理解，我试图执行几个基本的HTTP来自数据包级别的动作。我的问题是：我如何使用SCAPY这样的库在数据包级别构建HTTP GET请求和assosciated项目？我意识到这可能听起来很奇怪，但我似乎无法找到任何详细的信息，而我自己与PAROS和Ethereal的尝试一直......不满意。

感谢任何提供的帮助！

Trimiert

解决方案

你想做一个完整的三方握手，你必须手动完成。

从你的SYN数据包开始：

 >>> syn = IP（dst ='www.google.com'）/ TCP（dport = 80，flags ='S'）
>>> syn 
< IP frag = 0 proto = tcp dst = Net（'www.google.com'）|< TCP dport = www flags = S |>> 
  

然后从服务器接收SYN-ACK数据包，sr1正常工作。然后发送您的HTTP GET请求：

 >>> syn_ack = sr1（syn）
开始发射：
完成发送1个数据包。 
 * 
收到1个数据包，得到1个答案，剩下0个数据包
 
>>> syn_ack 
   

然后设置您的TCP序列和确认号码并发送GET：

  getStr ='GET / HTTP / 1.1 \r\\\
Host：www.google.com\r\\\
\r\''
 request = IP（dst ='www.google.com'）/ TCP（dport = 80，sport = syn_ack [TCP] .dport，
 seq = syn_ack [TCP] .ack，ack = syn_ack [ TCP] .seq + 1，flags ='A'）/ getStr 
 reply = sr1（请求）
  

I am a moderate programmer, just getting into network programming.

As an attempt to improve my understanding of networks in general, I am trying to perform several basic HTTP actions from the packet level. My question is this: How might I use a library such as SCAPY to build an HTTP GET request and assosciated items at the packet level? I realise this may sound odd, but I can't seem to find any information detailing it, and my own attempts with PAROS and Ethereal have been... Less than satisfactory.

Thanks for any offered help!

Trimiert

解决方案

If you want to do a full three-way handshake, you'll have to do it manually.

Start with your SYN packet:

>>> syn = IP(dst='www.google.com') / TCP(dport=80, flags='S')
>>> syn
<IP  frag=0 proto=tcp dst=Net('www.google.com') |<TCP  dport=www flags=S |>>

Then receive the SYN-ACK packet from the server, sr1 works. Then send your HTTP GET request:

>>> syn_ack = sr1(syn)
Begin emission:
Finished to send 1 packets.
*
Received 1 packets, got 1 answers, remaining 0 packets

>>> syn_ack
<IP  version=4L ihl=5L tos=0x0 len=44 id=424 flags= frag=0L ttl=55 proto=tcp chksum=0x2caa src=74.125.226.148 dst=10.20.30.40 options=[] |<TCP  sport=www dport=ftp_data seq=3833491143 ack=1 dataofs=6L reserved=0L flags=SA window=5720 chksum=0xd8b6 urgptr=0 options=[('MSS', 1430)] |<Padding  load='\x00\x00' |>>>

Then set your TCP sequence and ack numbers and send the GET:

getStr = 'GET / HTTP/1.1\r\nHost: www.google.com\r\n\r\n'
request = IP(dst='www.google.com') / TCP(dport=80, sport=syn_ack[TCP].dport,
             seq=syn_ack[TCP].ack, ack=syn_ack[TCP].seq + 1, flags='A') / getStr
reply = sr1(request)

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